States of Matter

As energy is added, the motion of the molecules increases and begins to overcome the attractions that molecules have for one another. If enough energy is added, the solid melts to a liquid and the liquid evaporates to a gas.

As energy is removed, the motion of the molecules decreases and and the attractions begin to overcome the motion of the molecules. If enough energy is removed, the gas condenses to a liquid and the liquid freezes to a solid.

States of Water

As energy is added, the motion of the water molecules increases and begins to overcome the attractions they have for one another.If enough energy is added, the ice melts to liquid water and the water evaporates to a water vapor.

As energy is removed, the motion of the molecules decreases and and the attractions begin to overcome the motion of the molecules. If enough energy is removed, the water vapor condenses to liquid water and the water freezes to ice.

Water Freezes

When water freezes, the water molecules arrange themselves in a regular hexagonal pattern.

The hydrogens of one water molecule are near the oxygens atoms of other water molecules.

Dry Ice in Water

When dry ice is placed in water, energy is transferred from the water to the dry ice. This energy causes the dry ice to change state from a solid directly to a gas. This gas is noticeable as the bubbles that form in the water.